package com.shuhe.common;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.net.URLDecoder;
import java.security.SecureRandom;

/**
 * @desc 加密工具类
 * @author : Ice
 * @date : 2022-10-12
 */
public class EncryptUtils {
    private final static String DES = "DES";
    private final static String ENCODE = "UTF-8";
    private final static String defaultKey = "Mininglamp";

    /**
     * 加密(使用defaultKey)
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        byte[] bt = encrypt(data.getBytes(ENCODE),defaultKey.getBytes(ENCODE));
        String str = new BASE64Encoder().encode(bt);
        return str;
    }

    /**
     * 解密(使用defaultKey)
     * @param data
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data) throws IOException, Exception {
        if (data == null) {
            return null;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf,defaultKey.getBytes(ENCODE));
        return new String(bt,ENCODE);
    }

    /**
     * 根据键值进行加密
     * @param data
     * @param key
     * @return 加密键byte数组
     * @throws Exception
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE));
        String str = new BASE64Encoder().encode(bt);
        return str;
    }

    /**
     * 根据键值进行解密
     * @param data
     * @param key
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data, String key) throws IOException,Exception {
        data = URLDecoder.decode(data);
        data = data.replace(" ", "+");
        if (data == null) {
            return null;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, key.getBytes(ENCODE));
        return new String(bt, ENCODE);
    }


    /**
     * 根据键值进行加密
     * @param data
     * @param key
     * @return 加密键byte数组
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey secretkey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);
        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE,secretkey,sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     * @param data
     * @param key
     * @return 加密键byte数组
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    public static void main(String[] args) {
        String key = "20251117";
        //String key = "tongc" + MyDateUtils.getNowDate().substring(0, 10);

        try {
            //String userName = EncryptUtils.encrypt("test2023", "jmpt2023");
            String userName = EncryptUtils.encrypt("ry", key);
            System.out.println(userName);
            userName = EncryptUtils.decrypt(userName, key);
            System.out.println(userName);



            userName = EncryptUtils.encrypt("ry");
            System.out.println(userName);
            userName = EncryptUtils.decrypt(userName);
            System.out.println(userName);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        //ZOkOGM2JXwo=
        //fZt05Z/5cjg=
    }

}
